I think we're going to have to take a hard look about what more we can do to prevent this kind of lone wolf attack.

We know that we have to have the right combinations of government policies and private sector energy and dynamism. Getting that balance right is what I know President Obama has tried to do, and at every turn he's been stopped.

While millions of American families, including mine and yours, were working hard paying our fair share, it seems Donald Trump was contributing nothing to our nation. Imagine that. Not fair. Nothing for Pell grants to help kids go to college. Nothing for veterans. Nothing for our military.

You're not a leader if you haven't been elected.

I have a comprehensive energy policy, but it really does include fighting climate change, because I think that is a serious problem.

The United States has kept the peace through our alliances. Donald Trump wants to tear up our alliances. I think it makes the world safer and, frankly, it makes the United States safer. I would work with our allies in Asia, in Europe, in the Middle East, and elsewhere. That's the only way we're going to be able to keep the peace.

Barack Obama is a man of great dignity.